package com.yuhang.jweb.common.security.shiro;

import java.util.Collection;
import java.util.List;

import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.Permission;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.yuhang.jweb.common.security.Principal;
import com.yuhang.jweb.common.util.SpringContextHolder;
import com.yuhang.jweb.common.util.UserUtils;
import com.yuhang.jweb.constant.Global;
import com.yuhang.jweb.service.SystemService;

public class SystemAuthorizingRealm extends AuthorizingRealm {

	private Logger logger = LoggerFactory.getLogger(getClass());

	private SystemService systemService;

	public SystemAuthorizingRealm() {
		this.setCachingEnabled(false);
	}

	/**
	 * 认证回调函数, 登录时调用
	 */
	@Override
	protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) {
		UsernamePasswordToken token = (UsernamePasswordToken) authcToken;
//
//		int activeSessionSize = getSystemService().getSessionDao().getActiveSessions(false).size();
//		if (logger.isDebugEnabled()) {
//			logger.debug("login submit, active session size: {}, username: {}", activeSessionSize,
//					token.getUsername());
//		}
//
//		// 校验登录验证码
//		if (LoginController.isValidateCodeLogin(token.getUsername(), false, false)) {
//			Session session = UserUtils.getSession();
//			String code = (String) session.getAttribute(ValidateCodeServlet.VALIDATE_CODE);
//			if (token.getCaptcha() == null || !token.getCaptcha().toUpperCase().equals(code)) {
//				throw new AuthenticationException("msg:验证码错误, 请重试.");
//			}
//		}
//
//		// 校验用户名密码
//		User user = getSystemService().getUserByLoginName(token.getUsername());
//		if (user != null) {
//			if (Global.NO.equals(user.getLoginFlag())) {
//				throw new AuthenticationException("msg:该已帐号禁止登录.");
//			}
//			byte[] salt = Encodes.decodeHex(user.getPassword().substring(0, 16));
			return new SimpleAuthenticationInfo(new Principal(null, true), "", null, getName());
//		} else {
//			return null;
//		}
	}

	/**
	 * 获取权限授权信息，如果缓存中存在，则直接从缓存中获取，否则就重新获取， 登录成功后调用
	 */
	protected AuthorizationInfo getAuthorizationInfo(PrincipalCollection principals) {
		if (principals == null) {
			return null;
		}

		AuthorizationInfo info = null;

		info = (AuthorizationInfo) UserUtils.getCache(UserUtils.CACHE_AUTH_INFO);

		if (info == null) {
			info = doGetAuthorizationInfo(principals);
			if (info != null) {
				UserUtils.putCache(UserUtils.CACHE_AUTH_INFO, info);
			}
		}

		return info;
	}

	/**
	 * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用
	 */
	@Override
	protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
		Principal principal = (Principal) getAvailablePrincipal(principals);
		// 获取当前已登录的用户
		if (!Global.TRUE.equals(Global.getConfig("user.multiAccountLogin"))) {
//			Collection<Session> sessions = getSystemService().getSessionDao().getActiveSessions(
//					true, principal, UserUtils.getSession());
//			if (sessions.size() > 0) {
//				// 如果是登录进来的，则踢出已在线用户
//				if (UserUtils.getSubject().isAuthenticated()) {
//					for (Session session : sessions) {
//						getSystemService().getSessionDao().delete(session);
//					}
//				}
//				// 记住我进来的，并且当前用户已登录，则退出当前用户提示信息。
//				else {
//					UserUtils.getSubject().logout();
//					throw new AuthenticationException("msg:账号已在其它地方登录，请重新登录。");
//				}
//			}
		}
//		User user = getSystemService().getUserByLoginName(principal.getLoginName());
//		if (user != null) {
			SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
//			List<Menu> list = UserUtils.getMenuList();
//			for (Menu menu : list) {
//				if (StringUtils.isNotBlank(menu.getPermission())) {
//					// 添加基于Permission的权限信息
//					for (String permission : StringUtils.split(menu.getPermission(), ",")) {
//						info.addStringPermission(permission);
//					}
//				}
//			}
//			// 添加用户权限
//			info.addStringPermission("user");
//			// 添加用户角色信息
//			for (Role role : user.getRoleList()) {
//				info.addRole(role.getEnname());
//			}
//			// 更新登录IP和时间
//			getSystemService().updateUserLoginInfo(user);
//			// 记录登录日志
//			LogUtils.saveLog(Servlets.getRequest(), "系统登录");
			return info;
//		} else {
//			return null;
//		}
	}

	@Override
	protected void checkPermission(Permission permission, AuthorizationInfo info) {
		authorizationValidate(permission);
		super.checkPermission(permission, info);
	}

	@Override
	protected boolean[] isPermitted(List<Permission> permissions, AuthorizationInfo info) {
		if (permissions != null && !permissions.isEmpty()) {
			for (Permission permission : permissions) {
				authorizationValidate(permission);
			}
		}
		return super.isPermitted(permissions, info);
	}

	@Override
	public boolean isPermitted(PrincipalCollection principals, Permission permission) {
		authorizationValidate(permission);
		return super.isPermitted(principals, permission);
	}

	@Override
	protected boolean isPermittedAll(Collection<Permission> permissions, AuthorizationInfo info) {
		if (permissions != null && !permissions.isEmpty()) {
			for (Permission permission : permissions) {
				authorizationValidate(permission);
			}
		}
		return super.isPermittedAll(permissions, info);
	}

	/**
	 * 授权验证方法
	 * 
	 * @param permission
	 */
	private void authorizationValidate(Permission permission) {
		// 模块授权预留接口
	}

	/**
	 * 获取系统业务对象
	 */
	public SystemService getSystemService() {
		if (systemService == null) {
			systemService = SpringContextHolder.getBean(SystemService.class);
		}
		return systemService;
	}

}